class_docstr: Test cases for "small data" conversion and I/O.
code: def test_to_json(self):
      pdf = self.pdf
      psdf = ps.from_pandas(pdf)
  
      self.assert_eq(
          psdf.to_json(orient="records"), pdf.to_json(orient="records")
      )
  
imports: import os
  import string
  import unittest
  import sys
  import numpy
  import pandas
  from pyspark import pandas
  from pyspark.testing.pandasutils import PandasOnSparkTestCase, TestUtils
  from pyspark.testing.sqlutils import SQLTestUtils
label_desc: Use image node_id 7 for calling the DataFrameConversionMixin obj's underlying member method code with example usage: obj.test_to_json() without return types